Depuis quelques temps, probablement depuis ma mise-à-jour vers le SP1 de windows 7, firefox fouille (environ 1 fois par jour) le dossier suivant :
C:\Windows\System32\catroot\{F750E6C3-38EE-11D1-85E5-00C04FC295EE}
Ça dure 10~20 secondes et, pendant ce temps, la fenêtre firefox freeze puis disparait (il reste néanmoins dans la barre des tâches), le curseur de souris se met en attente, le disque dur gratte comme un malade et je ne peut pas utiliser mon ordinateur. Puis le disque dur se calme et firefox réapparait, je reprends la main.

J'ai utilisé Procmon pour surveiller les accès disques pendant ce bug et il me donne des milliers de lignes de ce genre :
Code : Tout sélectionner
11:07:48,3164496 firefox.exe 2244 CreateFileMapping
C:\Windows\System32\catroot\{F750E6C3-38EE-11D1-85E5-00C04FC295EE}\Package_for_KB2656410_RTM~31bf3856ad364e35~amd64~~6.1.1.2.cat SUCCESS SyncType: SyncTypeOther
11:07:48,3165647 firefox.exe 2244 ReadFile
C:\Windows\System32\catroot\{F750E6C3-38EE-11D1-85E5-00C04FC295EE}\Package_for_KB2656410_RTM~31bf3856ad364e35~amd64~~6.1.1.2.cat SUCCESS Offset: 0, Length: 7 700, I/O Flags: Non-cached, Paging I/O, Synchronous Paging I/O, Priority: Normal
11:07:48,3278374 firefox.exe 2244 CloseFile
C:\Windows\System32\catroot\{F750E6C3-38EE-11D1-85E5-00C04FC295EE}\Package_for_KB2656410_RTM~31bf3856ad364e35~amd64~~6.1.1.2.cat SUCCESS
11:07:48,3279576 firefox.exe 2244 QueryDirectory
C:\Windows\System32\catroot\{F750E6C3-38EE-11D1-85E5-00C04FC295EE}\*.cat SUCCESS Filter: *.cat, 1: Package_for_KB2656410~31bf3856ad364e35~amd64~~6.1.1.2.cat
11:07:48,3282711 firefox.exe 2244 CreateFile
C:\Windows\System32\catroot\{F750E6C3-38EE-11D1-85E5-00C04FC295EE}\Package_for_KB2656410~31bf3856ad364e35~amd64~~6.1.1.2.cat SUCCESS Desired Access: Generic Read, Disposition: Open, Options: , Attributes: n/a, ShareMode: Read, AllocationSize: n/a, OpenResult: Opened
11:07:48,3288276 firefox.exe 2244 QueryNetworkOpenInformationFile
C:\Windows\System32\catroot\{F750E6C3-38EE-11D1-85E5-00C04FC295EE}\Package_for_KB2656410~31bf3856ad364e35~amd64~~6.1.1.2.cat SUCCESS CreationTime: 18/12/2012 18:15:33, LastAccessTime: 18/12/2012 18:15:33, LastWriteTime: 07/04/2012 01:26:30, ChangeTime: 18/12/2012 18:15:33, AllocationSize: 01/01/1601 01:00:00, EndOfFile: 01/01/1601 01:00:00, FileAttributes: SNCI
11:07:48,3288781 firefox.exe 2244 CreateFileMapping
C:\Windows\System32\catroot\{F750E6C3-38EE-11D1-85E5-00C04FC295EE}\Package_for_KB2656410~31bf3856ad364e35~amd64~~6.1.1.2.cat FILE LOCKED WITH ONLY READERS SyncType: SyncTypeCreateSection, PageProtection:
11:07:48,3289123 firefox.exe 2244 QueryStandardInformationFile
C:\Windows\System32\catroot\{F750E6C3-38EE-11D1-85E5-00C04FC295EE}\Package_for_KB2656410~31bf3856ad364e35~amd64~~6.1.1.2.cat SUCCESS AllocationSize: 8 192, EndOfFile: 7 700, NumberOfLinks: 1, DeletePending: False, Directory: False
11:07:48,3289799 firefox.exe 2244 CreateFileMapping
C:\Windows\System32\catroot\{F750E6C3-38EE-11D1-85E5-00C04FC295EE}\Package_for_KB2656410~31bf3856ad364e35~amd64~~6.1.1.2.cat SUCCESS SyncType: SyncTypeOther
11:07:48,3290432 firefox.exe 2244 ReadFile
C:\Windows\System32\catroot\{F750E6C3-38EE-11D1-85E5-00C04FC295EE}\Package_for_KB2656410~31bf3856ad364e35~amd64~~6.1.1.2.cat SUCCESS Offset: 0, Length: 7 700, I/O Flags: Non-cached, Paging I/O, Synchronous Paging I/O, Priority: Normal
11:07:48,3364890 firefox.exe 2244 CloseFile
C:\Windows\System32\catroot\{F750E6C3-38EE-11D1-85E5-00C04FC295EE}\Package_for_KB2656410~31bf3856ad364e35~amd64~~6.1.1.2.cat SUCCESS
11:07:48,3366045 firefox.exe 2244 QueryDirectory
C:\Windows\System32\catroot\{F750E6C3-38EE-11D1-85E5-00C04FC295EE}\*.cat SUCCESS Filter: *.cat, 1: Package_for_KB2656411_SP1~31bf3856ad364e35~amd64~~6.1.1.1.cat
11:07:48,3369215 firefox.exe 2244 CreateFile
C:\Windows\System32\catroot\{F750E6C3-38EE-11D1-85E5-00C04FC295EE}\Package_for_KB2656411_SP1~31bf3856ad364e35~amd64~~6.1.1.1.cat SUCCESS Desired Access: Generic Read, Disposition: Open, Options: , Attributes: n/a, ShareMode: Read, AllocationSize: n/a, OpenResult: Opened
11:07:48,3376461 firefox.exe 2244 QueryNetworkOpenInformationFile
C:\Windows\System32\catroot\{F750E6C3-38EE-11D1-85E5-00C04FC295EE}\Package_for_KB2656411_SP1~31bf3856ad364e35~amd64~~6.1.1.1.cat SUCCESS CreationTime: 10/03/2013 12:11:40, LastAccessTime: 10/03/2013 12:11:40, LastWriteTime: 12/02/2012 23:42:34, ChangeTime: 10/03/2013 12:11:40, AllocationSize: 01/01/1601 01:00:00, EndOfFile: 01/01/1601 01:00:00, FileAttributes: SNCI
11:07:48,3376970 firefox.exe 2244 CreateFileMapping
C:\Windows\System32\catroot\{F750E6C3-38EE-11D1-85E5-00C04FC295EE}\Package_for_KB2656411_SP1~31bf3856ad364e35~amd64~~6.1.1.1.cat FILE LOCKED WITH ONLY READERS SyncType: SyncTypeCreateSection, PageProtection:
11:07:48,3377312 firefox.exe 2244 QueryStandardInformationFile
C:\Windows\System32\catroot\{F750E6C3-38EE-11D1-85E5-00C04FC295EE}\Package_for_KB2656411_SP1~31bf3856ad364e35~amd64~~6.1.1.1.cat SUCCESS AllocationSize: 8 192, EndOfFile: 7 700, NumberOfLinks: 1, DeletePending: False, Directory: False
11:07:48,3377992 firefox.exe 2244 CreateFileMapping
C:\Windows\System32\catroot\{F750E6C3-38EE-11D1-85E5-00C04FC295EE}\Package_for_KB2656411_SP1~31bf3856ad364e35~amd64~~6.1.1.1.cat SUCCESS SyncType: SyncTypeOther
11:07:48,3378591 firefox.exe 2244 ReadFile
C:\Windows\System32\catroot\{F750E6C3-38EE-11D1-85E5-00C04FC295EE}\Package_for_KB2656411_SP1~31bf3856ad364e35~amd64~~6.1.1.1.cat SUCCESS Offset: 0, Length: 7 700, I/O Flags: Non-cached, Paging I/O, Synchronous Paging I/O, Priority: Normal
11:07:48,3496994 firefox.exe 2244 CloseFile
C:\Windows\System32\catroot\{F750E6C3-38EE-11D1-85E5-00C04FC295EE}\Package_for_KB2656411_SP1~31bf3856ad364e35~amd64~~6.1.1.1.cat SUCCESS
11:07:48,3497999 firefox.exe 2244 QueryDirectory
C:\Windows\System32\catroot\{F750E6C3-38EE-11D1-85E5-00C04FC295EE}\*.cat SUCCESS Filter: *.cat, 1: Package_for_KB2656411~31bf3856ad364e35~amd64~~6.1.1.1.cat
11:07:48,3500450 firefox.exe 2244 CreateFile
C:\Windows\System32\catroot\{F750E6C3-38EE-11D1-85E5-00C04FC295EE}\Package_for_KB2656411~31bf3856ad364e35~amd64~~6.1.1.1.cat SUCCESS Desired Access: Generic Read, Disposition: Open, Options: , Attributes: n/a, ShareMode: Read, AllocationSize: n/a, OpenResult: Opened
11:07:48,3506532 firefox.exe 2244 QueryNetworkOpenInformationFile
C:\Windows\System32\catroot\{F750E6C3-38EE-11D1-85E5-00C04FC295EE}\Package_for_KB2656411~31bf3856ad364e35~amd64~~6.1.1.1.cat SUCCESS CreationTime: 10/03/2013 12:11:40, LastAccessTime: 10/03/2013 12:11:40, LastWriteTime: 12/02/2012 23:42:37, ChangeTime: 10/03/2013 12:11:40, AllocationSize: 01/01/1601 01:00:00, EndOfFile: 01/01/1601 01:00:00, FileAttributes: SNCI
11:07:48,3506990 firefox.exe 2244 CreateFileMapping
C:\Windows\System32\catroot\{F750E6C3-38EE-11D1-85E5-00C04FC295EE}\Package_for_KB2656411~31bf3856ad364e35~amd64~~6.1.1.1.cat FILE LOCKED WITH ONLY READERS SyncType: SyncTypeCreateSection, PageProtection:
11:07:48,3507242 firefox.exe 2244 QueryStandardInformationFile
C:\Windows\System32\catroot\{F750E6C3-38EE-11D1-85E5-00C04FC295EE}\Package_for_KB2656411~31bf3856ad364e35~amd64~~6.1.1.1.cat SUCCESS AllocationSize: 8 192, EndOfFile: 7 700, NumberOfLinks: 1, DeletePending: False, Directory: False
etc.......
J'ai fait un scan malwarebyte antimalware, ccleaner, et microsoft security essentials : rien.
Mes questions :
Pourquoi firefox lit-il (écrit-il) dans ce répertoire ?
Pourquoi firefox s'accapare-t'il toutes les ressources de mon pc jusqu'à le bloquer quelques secondes ?
Comment arrêter ça ?
Ma config :
Windows 7 64bits SP1 authentique
Firefox 19.0.2
Extensions firefox :
Adblock plus
Element hiding helper
FireFtp
Firegesture
Flagfox
gTranslate
Mozilla labs Prospector Speak words
Stylish
Plugin firefox :
Flash 11.6
Quelqu'un aurait une idée du problème, parce que google me donne rien...
Merci à vous de votre aide !

Votre Navigateur : Mozilla/5.0 (Windows NT 6.1; WOW64; rv:19.0) Gecko/20100101 Firefox/19.0